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include "tbtables.h"
include "tblerr.h"
# tbznll -- set rows to null
# This procedure sets all columns in a range of rows to INDEF.
# If the first row to be deleted is greater than the last row, or if
# the range of rows is outside the allocated size of the table, nothing
# is done. It is not considered an error if the first row is less than
# one or the last row is greater than the number of allocated rows in
# the table.
#
# Phil Hodge, 3-Feb-1992 Subroutine created.
procedure tbznll (tp, firstrow, lastrow)
pointer tp # i: pointer to table descriptor
int firstrow # i: first row to be set to INDEF
int lastrow # i: last row to be set to INDEF
#--
pointer cp # pointer to a column descriptor
int row1, row2 # firstrow, lastrow truncated to 1, nrows
int row # loop index for row number
int col # loop index for column number
int datatype # data type of a column
int lenstr # length of a string table element
int ip # offset to a string in Memc
pointer tbcnum()
begin
row1 = max (1, firstrow)
row2 = min (TB_ALLROWS(tp), lastrow)
# Set each column value in each row to INDEF.
do col = 1, TB_NCOLS(tp) {
cp = tbcnum (tp, col)
datatype = COL_DTYPE(cp)
if (datatype == TBL_TY_DOUBLE) {
do row = row1, row2
Memd[COL_OFFSET(cp) + row - 1] = INDEFD
} else if (datatype == TBL_TY_INT) {
do row = row1, row2
Memi[COL_OFFSET(cp) + row - 1] = INDEFI
} else if (datatype < 0) {
do row = row1, row2 {
lenstr = -COL_DTYPE(cp) # not including EOS
ip = (row - 1) * (lenstr + 1) # including EOS
Memc[COL_OFFSET(cp) + ip] = EOS
}
} else {
call error (ER_TBCOLBADTYP, "tbznll: bad datatype")
}
}
end
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